<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>22.CSS默认样式</title>
        <style>
            ul{list-style:circle;}
            a{text-decoration: none;color:#999;}
            a:hover{text-decoration: underline;color: red;}
            div{border: 1px solid black;}
            img{vertical-align: bottom;}
        </style>
    </head>
    <body>
        <!-- <div>这是一个块</div>
        <span>这是</span>
        <h1>标题</h1>
        <p></p>
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
        <a href="#">这是一个链接</a> -->
        <div>
            <img style="display: inline-block; width: 100%; max-width: 100%; height: auto;" src="./images/jj20.jpg" alt="">
        </div>
    </body>
</html>